Dental engine.



No. 732,387. P ATENTED JUNE 30, 1903. I J. B. WANTZ.

DENTAL ENGINE.

APPLIOATIONIILED FEB. 9, 190a.

W, W E

N0 MODEL.

UNITED STATES Patented June 30, 1903.

PATENT OFFICE.

JULIUS B. VVANTZ, OF CHICAGO, ILLINOIS, ASSIGNOR TO VICTOR ELECTRICCOMPANY, A CORPORATION OF ILLINOIS.

DENTAL ENGINE.

SPECIFICATION forming part of Letters Patent N 0. 732,387, dated June30, 1903. Application filed February 9, 1903. Serial No. 142,562. (Nomodel.)

In carrying out my invention I mount the engine proper, preferably anelectric motor,

on the forward or free end of a counterbalauced lever, the connectionbetween the lever and its support being in the nature of a universaljoint to permit ready movement of" the lever in planes at right anglesto eachv other and give it desired stability in any adjusted position,all the connections being such as to permit the flexible shaft extensionof the motor to be moved in any direction and to any position withdesired freedom.

In the drawings, Figure 1 is a broken View showing my improvedsupporting-bracket, moving parts being shown in one position by fulllines and in a raised position by dotted lines; and Fig. 2, an enlargedand broken section taken on the line 2 in Fig. 1.

A is a stationary arm or bracket adapted to be fastened against a wall Xor to be secured in place in any other convenient way. In the free endof the bracket is a vertical cylindrical bearing-socket a.

B is a bearing-block presenting a flat vertical face 6 and having acentral upwardprojecting cylindrical stud c fitting the socket a torotate therein. Interposed between the block and bracket is a washer d,and the parts are held against separation by the engagement of a pin 6in the bracket with an annular groove f in the stud c. Fitting againstthe face I) is a disk 0, journaled upon a bolt 9, which passes throughan openingin the block B into a nut h. Interposed between the head ofthe bolt and face of the disk C is an elastic cup-shaped friction-diskD, which bears against the disk to prevent too ready turning thereof onthe bolt.

horizontal plane.

E is a lever, which consists-of the upper and lower tubes 2' it, comingtogether at opposite ends,as shown. The tubes extend near one end acrossthe upper and lower sides of the disk or fulcrum-block C, beingpermanently fastened thereto. On the end of the rear or short arm of thelever is a rod or extension l, carrying aspherical counterweight F. Haning from the free end of the forward or long arm of the lever E is aflexible suspending medium m, carrying a bail or stirrup 'n.

.G is the spherical casing of an electric motor, pivotally mounted atopposite sides midway between its upper and lower ends between the endsof the bail n to swing freely therein. The armature-shaft of the motorhas a coupling at its lower end to engage with the flexible shaftextension H. The block B turns in the bearing a to permit the lever E tobe swung to any position in the The weight F counterbalances the longarm of the lever, with the motor G and shaftH suspended therefrom. Thefriction-cup D presses yieldingly against the disk C, to which the leveris rigidly secured, and thus prevents too ready swinging of the lever inthe vertical plane. The operator may lower the lever to any position bypulling downward upon the flexible shaft H, while by forcing the saidshaft upward the lever will rise to any position desired. The object ofthe friction-cup is to give to the lever desired stability in anyposition to which it is moved'by the operator The pressure of thefriction-cup may be increased or diminished by turning the boltg in thenut h.

The conducting-wires 10 extend along the arm A, as shown, and into thetube It near the fulcrum, passing out of the tube at a point adjacent tothe motor.

My improved construction provides a supporting-bracket which isparticularly convenient and always under perfect control. It

is strong and durable and attractive in appearance.

The motor G by being freely suspended and pivotally mounted in the bailn adapts itself to every movement of the operator. A slight upwardmovement of the flexible shaft causes the lever to ascend, and it may beswung in either direction to be out of the way when not in use.

What I claim asnew, and desire to secure by Letters Patent, is

1. In a. dental engine, the combination of a support, a counterbalancedarm thereon having a vertical and a horizontal movement, meanspermitting such movements comprised of a member swiveled to the supportto rorate in a horizontal plane, and a pivot connecting the member andarm to allow movement of the latter in a vertical plane, and a motor onone end of the arm.

2. In a dental engine, the combination of a stationary support, a memberswiveled thereto to rotate in a horizontal plane, an arm swiveled tosaid member to rotate in a vertical plane, a motor on one end of the armand a counterbalance-weight on the opposite end of the arm.

3. In a dental engine, the combination with a stationary support, amember swiveled thereon to turn in a horizontal plane, a disk swiveledon the member to turn in a vertical plane, an arm mounted on the disk ata point intermediate of its length to be swung in a horizontal plane bythe movement of the member and to be raised and lowered in a verticalplane in the movement of the disk, a motor on the forward end of the armand a counterbalance on the rear end thereof.

JULIUS I3. WANTZ.

In presence of- WALTER WINBERG, WM. B. DAVIES.

